JPH05212186A - Bobbin thread monitoring method and apparatus for stitch forming apparatus - Google Patents

Abstract

PURPOSE: To output a control function when at the beginning of consumption of a set thread residual amount and to output a different control function when it drops below a minimum value by comparing both signal progresses in a comparator circuit and generating the control function for reporting the change of a rotating direction when a detected phase deviation does not match with a target phase deviation. CONSTITUTION: A comparator 45 receives a main signal progress received by a main sensor 19 and a reference signal progress received by a reference sensor 20 in a cycle supplied in an increment generator 43 and calls a comparison signal pair from a memory 47 when a finally received signal pair is different from the signal pair before that. When an actual signal pair matches with the comparison signal pair, signals H are sent from the comparator 45 to a bobbin jitter dissolving device 49. In the case that it does not match, the signals of extremely small strength are sent to the bobbin jitter dissolving device 49 and the change of the rotating direction of a bobbin 6 is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a bobbin of a shuttle wound around a bobbin in a direction opposite to the direction in which the main yarn is wound with a yarn winding portion having a previously determined yarn remaining amount. A stitch forming machine in which the direction of rotation of the bobbin changes in the direction opposite to the direction of rotation in the case of withdrawing the main thread, and the control function is generated by this change in the direction of rotation of the bobbin. The present invention relates to a yarn monitoring method and device.

[0002]

From German Patent No. 493969, a stockpile monitoring device is known for monitoring the thread stockpile of a bobbin. In this device, since the rotation direction is changed when winding the bobbin thread, the remaining amount of the thread is wound in the winding direction opposite to the main thread amount. As long as the bobbin maintains the direction of rotation which is related to the main thread amount, the bobbin releasing mechanism which is operated at the end of each sewing process does not operate. On the other hand, when the remaining amount of yarn starts to be consumed, the bobbin rotates in the opposite direction, and the discharging mechanism performs its function.

Since the discharge mechanism is activated only at the end of one sewing process, the control function caused by the change in the direction of rotation of the bobbin is not performed immediately when the direction of rotation is changed, especially when the stitch length is compared. In the case of a very long period of time, it takes place considerably later, and in some cases, only after the yarn remaining amount has been completely consumed. Therefore, the stockpile monitor cannot be reliably monitored by this known stockpile monitor, and it is almost impossible to detect other troubles of the bobbin thread, for example, troubles such as yarn breakage.

DE-A-3540126 discloses a device called a built-in yarn monitoring / process monitoring system. In this device, one bobbin is monitored by its two sensors for its direction of rotation. The two sensors are oriented on the flange of the bobbin with the light and dark areas and are arranged side by side at half the distance of the light and dark areas.

The two sensors are provided only for checking whether the bobbin is properly mounted by monitoring the direction of rotation of the bobbin during the winding process, and the direction of rotation of the bobbin is sufficient. Nothing is disclosed about the point to utilize for.

From German Patent Publication DE 38 00 717 there is known a yarn monitoring device for bobbin yarns. The sensor receives a signal during bobbin rotation and is connected to a stitch counter. The stitch counter is reset to an initial value by each signal and therefore to a predeterminable end value only if no further signal is received and the reset process takes place due to a bobbin stop caused by a thread break or thread end. Reach

Since this thread monitoring device detects a thread failure when the bobbin is stopped, it is possible to prevent the continuation of the stitch forming process in which no stitch is formed. However, the thread monitoring device monitors the thread stock on the bobbin. Because I can't
Only when the bobbin thread is almost completely consumed is the thread end detected. With such a small amount of thread, the seam formation can be continued only after being stopped midway in order to replace the empty bobbin with the filled bobbin.

German Patent No. 49396 mentioned at the outset
According to the specification No. 9, one bobbin is used to monitor the stockpiling of the yarn, and the remaining amount of the yarn is wound on the one bobbin in a direction opposite to the winding direction of the main yarn amount. There is no suggestion of a device for winding a thread on a bobbin in this way.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for monitoring a bobbin thread in a stitch forming machine and a device for carrying out this method, which controls when a predeterminable thread remaining amount starts to be consumed. The function is to be output, and another control function is to be output with almost no delay when the value of the thread remaining amount falls below the minimum value that can be determined in advance or when thread breakage occurs.

Another object of the present invention is to provide a device for winding a previously-determinable yarn remaining amount on a bobbin in a direction opposite to that of the main yarn amount.

[0011]

SUMMARY OF THE INVENTION To solve the above problems, the present invention comprises in a method: a) generating a signal for a control device when the bobbin rotates, b) from this signal Forming a first signal course at one monitoring position, or c) receiving a second signal course at the second monitoring position that has a phase shift with respect to the first signal course, Or determining the order of the first signal course, d) evaluating the at least one signal course depending on the stitch forming frequency, e) between the first signal course and the second signal course. When the phase shift changes or when it is confirmed that the order of the signals of the first signal has changed, a control function indicating the start of consumption of the remaining thread amount and / or restart of the sewing machine after the stop To output a control function to prevent When one of the signal curve is continuously interrupted until a f) predeterminable number of stitch forming cycle, to generate a control function for terminating the sewing process, and is characterized in.

In a device for carrying out this method, the direction-of-rotation detector has a comparator which detects the phase shift between the two signal traces by comparing the two signal traces with each other. Control for notifying the change of rotation direction when the detected phase shift and the target phase shift do not match by the comparison device. The rotation direction detector has a comparison device, and the comparison device outputs the signal of the first signal progress in the order of the bobbin at the time of consumption of the main yarn amount. Of the target signal which is related to the rotation direction of the target signal, and when the comparison of the first signal and the target signal does not match, the comparison device knows the change of the rotation direction. It is characterized in that the control function allowed generation for.

In a device for winding a predefinable yarn remaining amount on a bobbin in the opposite direction to the main yarn amount, it is preferably set on a counting device after the bobbin has reached a predeterminable filling degree. After the bobbin shaft has rotated as many times as possible, the direction of rotation of the bobbin shaft can be changed, and the turning element for turning the yarn is adjusted by the position adjusting device from the stationary position located outside the yarn supply path to It is characterized in that it can move to a turning position located inside the yarn supply path.

According to the first aspect, the comparison device can be constructed particularly simply.

The second aspect of the present invention shows an advantageous configuration of the comparison device according to the second aspect, and the comparison device continuously detects the comparison process for detecting the difference in the phase shift with respect to the target phase shift. It need not be performed and can be done at a predeterminable stage of stitch formation. This considerably reduces the monitoring effort.

As a result of the vibration of the sewing machine associated with the driving of the sewing machine, the bobbin can carry out the forward and backward movements only when the tension of the thread is reduced, for example due to the sagging of the thread. In order to prevent this process known as bobbin jitter from being evaluated as a change in the direction of rotation of the bobbin, according to embodiment 3, the direction of rotation detector comprises a bobbin jitter canceller. With this bobbin jitter canceller, during a predetermined number of stitch formation cycles,
When the rotation direction detector detects that the bobbin is rotating in the rotation direction related to the main thread amount and is rotating in the opposite direction, the signal indicating the change in the rotation direction is output. Output can be interrupted.

According to the construction of item 4, in a particularly simple manner for each thread fault that can be detected,
Predeterminable control functions can be associated.

In the case of outputting the control function for immediately stopping the stitch formation in the middle of the seam, it is known from the additional device (DE 3819059) as a device for carrying out the method handled therein. According to the constitution of the device according to the fifth embodiment, the sewing product is fed backward until the last normal knot of the upper thread and the lower thread is located under the needle. To be done.
After supplying the new bobbin thread, the bobbin thread is tied with the bobbin thread by at least one stitch forming cycle performed without transporting the sewn product. Next, the formation of the seam is continued in the same feeding step as that before the yarn failure occurs and in the feeding direction.

The turning element can remain in its turning position for the rest of the winding process, or, according to embodiment 6, after the yarn has been wound a further predeterminable number of times, it returns to its rest position. can do.

According to the seventh aspect, the device according to the fourth aspect can be advantageously constructed.

In the construction of the eighth aspect, the turning element is a driving slit required for the winding process on the way to the turning position, and is therefore formed on each of both flanges of the commercially available bobbin. Penetrate the entrainment slit.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The first embodiment of the shuttle drive device shown in FIG. 1 has a shuttle drive shaft 2 drivingly connected to the upper shaft 1 (FIG. 2) of the sewing machine in a manner not shown. An outer hook 3 is fixed to the hook drive shaft 2 so as not to rotate relative to it. A bobbin lower case 4 is supported in the outer hook 3. The lower bobbin case 4 has a center pin 5 for receiving the bobbin 6. On the bobbin 6, as shown in the portion U of FIG.
The remaining amount of bobbin yarn is wound in the winding direction opposite to the main yarn amount.

The bobbin 6 is provided with a marking portion 10 formed from a bright / dark area 9 on the outer surface of the flange 8 on the bobbin upper case 7 side.

The bobbin upper case 7 is provided with an opening 11 for letting in and out a light beam. The light beam is detected by the light emitting diode 12 of the first sensor device 13 and the light emitting diode 14 of the second sensor device 15, reflected by the marking unit 10, and then detected by the photoelectric detector 16 and the first sensor device 13 of the first sensor device 13. Photoelectric detector 1 of sensor device 15 of 2
Sent to 5.

FIG. 2 is a schematic circuit diagram of the controller 18. The control device 18 is connected to the emitters of both photoelectric detectors 16 and 17, which are configured as phototransistors. Both photoelectric detectors 16 and 17
In the following, the first photoelectric detector 16 will be referred to as the main sensor 19 below.
And the second photoelectric detector 17 will be referred to as a reference sensor 20.

Current flows from the positive pole of the regulated power supply to ground via the light emitting diode 12 and the resistor 21, or via the main sensor 19 and the resistor 22. Similarly, the current from the positive pole of the power source is the light emitting diode 14 and the resistor 2
3 or through reference sensor 20 and resistor 24 to ground.

An amplifier 25 is provided at the emitter of the main sensor 19.
Are connected. The amplifier 25 is connected to a reset input RE of a counter 28, which acts as a thread break detector 27. The counter 28 further has an input E.
At the start of the sewing process, a signal M is supplied to the input section E from the control section 29 of the drive motor 30 of the sewing machine that drives the upper shaft 1 via the V belt 31 for a predetermined number of stitch forming cycles. ..

To set the counter 28, the counter 28
A signal for determining the final value of the counter can be sent via the set input section SE. The final value of the counter is preselected in the adjusting element 32 connected to the set input SE.

The controller 18 includes a position detector 33. The position detector 33 is a light-emitting diode 34 connected to the positive pole of the regulated power supply and grounded via a resistor 35, and a light-emitting diode 34 connected to the positive pole as a phototransistor. A photoelectric detector 36, which is grounded via a resistor 37, and a second photoelectric detector 38, which is also connected to the positive pole and is configured as a phototransistor, and which has a resistor 39. And a photoelectric detector 38 which is grounded via. A disc 40 is fixed to the upper shaft 1 between the light emitting diode 34 and the photoelectric detectors 36 and 38. The disc 40 has a large number of slits 41 formed at equal intervals in the optical path between the light emitting diode 34 and the first photoelectric detector 36, and includes the light emitting diode 34 and the second photoelectric detector 38. It has one opening 42 in the optical path between them. The part of the position detector 33 which has the photoelectric detector 36 forms the incremental generator 43, while the photoelectric detector 38
The portion including the ∘ acts as the stitch pulse generator 44.

The stitch pulse generator 44 includes a counter 28.
Is connected to the counting input unit ZE. On the other hand, the incremental generator 4
3 is connected to the pulse input unit TE of the comparison device 45. The comparison device 45 connects the main sensor 19 via the amplifier 25.
A main signal input section HE connected to the reference sensor 20 and a reference signal input section B connected to the reference sensor 20 via an amplifier 46.
Have E and. The comparison device 45 has a memory 47 and a pulse generator 48.

The output A of the comparison device 45 is connected to the bobbin jitter canceller 49. Bobbin jitter canceller 49
To the stitch pulse generator 4 via the pulse input unit TE.
4 pulses are sent. The comparison device 45 forms a rotation direction detector 50 together with the bobbin jitter canceller 49.

The output A of the bobbin jitter canceller 49 is connected to the rotation direction signal input DRE of the error decoder 51. The rotational direction signal input DRE can also be formed by programmable logic elements, like the comparator 45 and the bobbin jitter canceller 49. Further, the error decoder 51 has a yarn break signal input section BE to which the output section A of the counter 28 is connected, and an internal counter 52. The stitch pulse generator 44 is connected to the input section ZE of the counter 52.

The error decoder 51 has three output sections. The yarn breakage signal output unit BA is connected to the input unit of the control unit 29 of the drive motor 30 via the amplifier 53, and the first rotation direction signal output unit DRA1 is connected to the input unit of the control unit 29 of the drive motor 30. Second rotation direction signal output section D
RA2 is connected by an amplifier 55 to a display element 57 which is grounded via a resistor 56.

Next, the operation of the above first embodiment will be described.

During the sewing process, the light emitting diodes 12 and 14
Rays of light pass through the opening 11 of the bobbin upper case 7 and illuminate the marking portion 10 and are reflected by the marking portion 10.
After exiting the opening 11 again, it is sent as a signal to the main sensor 19 and the reference sensor 20. These signals are received by the main sensor 19 as a first signal course (hereinafter referred to as the main signal course), while the reference sensor 20 produces a second signal course that is out of phase with respect to the main signal course (see Signal progress). The reference sensor 20 is out of phase with respect to the main signal due to the reference sensor 20.
Is arranged so as to be displaced from the main sensor 19 by a predetermined rotation angle. In this case, the main sensor 1
9 is arranged in front of the reference sensor 20 in the direction of rotation of the bobbin 6, as shown in FIG.
1 precedes the reference signal curve X2 by a phase shift V1.

When the marking portion 10 is provided with the light / dark areas 9 as shown in FIG. 3, unless the rotation direction of the bobbin 6 is changed, the two light / dark areas 9 arranged side by side are mainly formed. Monitoring area I of sensor 19 or reference signal 20
Signal passages X1 and X2 when passing through the monitoring area II of
Is repeated. In the case of the illustrated embodiment, this is when the bobbin has rotated 90 °. Although four bobbin positions are shown in FIG. 3, these bobbin positions have two bright positions.
It is a position that elapses when it is rotated by a rotation angle corresponding to the dark region 9, and at these bobbin positions, another signal is generated at least in both of the signal elapses X1 and X2.

In FIG. 4, the main signal curve X1 and the reference signal curve X2 are graphed with respect to the rotation angle of the bobbin 6. In this case, the rotation angle W1 is when the bobbin is in the position A of FIG. 3, and the rotation angle W2 is when it is in the position B of FIG.
The rotation angle W3 is at the position C in FIG. 3, and the rotation angle W4 is at the position D in FIG. The main sensor 19 receives a relatively low intensity signal (hereinafter simply referred to as signal L) when the rotation angle is W1, while the reference sensor 20 has a relatively high intensity signal (hereinafter simply referred to as signal H). Note)). At the rotation angle W2, both sensors receive the signal L, at the rotation angle W3, the main sensor 19 receives the signal H and the reference sensor 20 receives the signal L. At the rotation angle W4 both sensors receive the signal H. The signal pair received at the rotation angle W5 is the rotation angle W
It corresponds to the signal pair at the time of 1. The order of the signal pairs is tabulated separately in FIG. 5 for the signal paths X1 and X2.

After mounting the bobbin 6 filled with the lower thread,
Before the sewing process is started, the bobbin 6 is rotated by pulling out the bobbin thread. In this case, the main signal curve X1 received by the main sensor 19 is sent to the input HE of the comparator 45, and the reference signal curve X2 received by the reference sensor 20 is sent to the input BE of the comparator 45.
The comparator 45 receives at its inputs HE and BE one signal pair each at a period given by its pulse generator 48, and this signal pair is stored only if it differs from the preceding signal pair. Read at 47. As a result, the signal pairs are listed in the memory 47. The order corresponds to that of FIG.

When the sewing process starts, the comparison device 45 receives the main signal course received by the main sensor 19 at the input part HE at the cycle given to the input part TE by the increment generator 43, The input signal BE receives the reference signal course received by the reference sensor 20, and the comparison signal pair is called from the memory 47 when the last received signal pair is different from the previous signal pair. As long as the direction of rotation of the bobbin 6 does not change, and thus the phase shift V1 between the two signal paths X1 and X2 does not occur, the respective actual signal pair corresponds to the comparison signal associated with it. This is because when the phase shift V1 is unchanged, the actual signal pairs are read by the input units HE and BE of the comparison device 45 in the same order as the comparison signal pairs stored in the memory 47.

When a change D in the rotating direction occurs on the bobbin 6,
For example, if the rotation direction changes when passing the rotation angle W3 in FIG. 6, the phase shift between the signal curves X1 and X2 is opposite to the phase shift of the target signal track in FIG. That is, as shown in FIG. 6, the main signal course X1 is delayed from the reference signal X2 by a phase shift V2. The order of the actual signal pairs read by the inputs HE and BE of the comparison device 45 is listed in FIG. 7, which is different from the comparison signal pairs of FIG.

When the actual signal pair matches the comparison signal pair, the signal H is sent from the output A of the comparison device 45 to the bobbin jitter canceller 49. If they do not match, a very low intensity signal (signal L) is sent to the bobbin jitter canceller 49, which indicates the change in the direction of rotation of the bobbin 6.

In particular, when the tension of the thread is remarkably reduced due to the sewing technique, the bobbin 6 may move forward and backward alternately for a short period of time when the sewing machine vibrates due to the driving. In order to avoid an error display due to this phenomenon called bobbin jitter in the sewing technique, the bobbin jitter canceller 49 rotates while the predetermined number of stitch formation cycles displayed via the stitch pulse generator 44 has elapsed. The direction signal is input to the error decoder 51 at the input section DR.
Before sending to E, the bobbin jitter canceller 49
5. Receive multiple signals of 5. This rotation direction signal (signal H) is the rotation direction of the bobbin 6 in which all the signals received at the input E of the bobbin jitter canceller 49 are related to the main yarn amount, or between this rotation direction and another rotation direction. In the case of notifying the constant replacement of the bobbin 6, it indicates that the rotation direction of the bobbin 6 is unchanged. Correspondingly, the bobbin jitter canceller 49 has a predetermined number of consecutive signals.
When the change in the direction of rotation is constantly indicated by the input section E of,
The bobbin jitter canceller 49 sends a rotation direction signal (signal L) having a small intensity from its output A to the error decoder 51.

When the error decoder 51 receives the signal H at its input section DRE, the control section 29 of the drive motor 30 is controlled by the signal of the output section DRA1, and the drive motor 3 is driven.
Zero cannot be started after the stopping process of the sewing machine. Further, the display element 57 is turned on by the continuation signal of the output unit DRA2. To turn off the display element 57, the error decoder 51 is sent a signal generated by the operator in a manner not shown.

At the same time when the signals are output from the output units DRA1 and DRA2, the counter 52 of the error decoder 51 receives the signal of the stitch pulse generator 44, and after reaching the predeterminable count value, the error decoder 51. Is its output D
A second signal is issued from RA1 to the control unit 29 of the drive motor 30. The drive motor 30 is stopped by this second signal. The count value is selected so that the yarn remaining amount is almost consumed after the count value is reached.

The counter 28 connected to the input BE of the error decoder 51 receives the pulses of the stitch pulse generator 44 at its count input ZE and accumulates them.
Each time the signal received by the main sensor 19 changes, the counter 28 is reset via its input RE to its initial value. This reset takes place as long as the bobbin thread is safely withdrawn and the bobbin 6 is driven before the counter 28 reaches the preselected selectable final value via the adjusting element 32. The final count value is advantageously chosen such that it is not reached by slight looseness of the thread, which can occur during the sewing process and can temporarily stop the bobbin. On the other hand, when the bobbin continues to be stopped due to thread breakage, the signal H is counted up to the final count value and the signal H is output from the output of the counter 28 instead of the signal L previously output from this output. It is output to the input section BE of the error decoder 51. As a result, a signal is output from the output unit BA of the error decoder 51 to the control unit 29 of the drive motor 30, and the drive motor 30 is stopped accordingly.

The drive motor 30 is operated after the obstacle of the thread is eliminated.
When restarting the counter 28, the control unit 29 sends the signal M to the input unit E of the counter 28 for a predetermined number of stitch forming cycles, and the switching function of the counter 28 is temporarily interrupted. It This procedure is purposeful to avoid mislabeling. This erroneous display is due to the function of the sewing machine, such as thread cutting, which causes a large looseness of the thread before the sewing process.

The sewing machine is equipped with an additional device 58. The add-on device 58 makes it possible to carry out the method known from DE 3819059 A1 and the positioning motor 3
0 is connected to the control unit 29. This add-on device 58 operates by the signal of the error decoder 51 or the signal generated by the operator. However, when the drive motor 30 is stopped in the middle of one stitch, the add-on device 58 is removed after the obstacle of the thread is removed. Thus, it is possible to continue forming the seam so that the upper thread is not interrupted in the sewn product.

In the second embodiment shown in FIG. 8, the bobbin 6
A binary code portion 63 is formed on the outer surface of the flange 61 of the second sensor device 60 side. This binary code part 63 is
It is divided into four code segments 64 of the same type existing in the angle range of 90 °. The light beam of the light emitting diode 65 of the sensor device 60 hits the binary code part 63 and is reflected, and then goes to the sensor 67 of the sensor device 60 formed by the photoelectric detector 66.

FIG. 9 is a simplest circuit diagram of the control device 68. The sensor 67 is structurally matched with the main sensor 19 of the sensor device 13 of the first embodiment, and is therefore illustrated in a simplified manner.

The sensor 67 is connected to the signal input section SE of the analog / digital converter 69 and the reset input section RE of the counter 28. The counter 28 is used to accumulate the stitch pulse period displayed by the stitch pulse generator 44 of the position detector 33, which is shown schematically.

The analog / digital converter 69 has a pulse input section TE. This pulse input TE is connected to the output AT of a control element 70 which is configured as a microprocessor. The control element 70 has an output section AT.
It has a pulse generator T1 for presetting the pulses output from. The output unit AT is a register 7 of a 2-register memory 74 (hereinafter simply referred to as ZR memory).
2, 73 and the input unit KE1 of the autocorrelator 75 (Autokorrelator).

Output A of the analog / digital converter 69
Is an input section K of the autocorrelator 75 via the ZR memory 74.
It is connected to E2 and KE3. The output KA of the autocorrelator 75 is connected to the input EM of the mean value generator 76. The output AM of the average value generator 76 is connected to the input EN1 of the standardizer 77. The registers 72 and 73 of the ZR memory 74 are connected to the second input EN2 of the standardization device 77, and the output AN of the control element 70 is connected to the third input EN3. The output A of the standardizer 77 is connected to the input KE1 of a cross-correlator 78, the second input KE2 of the cross-correlator 78 being the output AK1 of the control element 70 and the third. The output AK2 of the control element 70 is connected to the input KE3 of the. The output KA of the cross-correlator 78 is connected to the input EK of the control element 70. The cross-correlator 78 acts as a comparison device 79.

Input EZ and output AZ of the control element 70
An operation panel 80 is connected to the device via an intermediate memory 81. A memory 82 is connected to the input section EE and the output section AE of the control element 70, and the control element 7 is connected to the memory 82.
A program is stored for presetting the step sequence to be performed by 0. This sequence of steps is called from the memory 82 by addressing at the output AE of the control element 70 with the rhythm set by the pulse generator T2 of the control element 70 and read at the input EE.

The components 69 to 82 form a rotational direction detector 83. This rotation direction detector 83 is connected to the input section DRE of the error decoder 51 via the output section AF of the control element 70.

As already described in the first embodiment, the counter 2 of the yarn breakage detector 27 is provided at the input portion BE of the error decoder 51.
8 outputs A are connected. The connection of the error decoder 51 to the output section corresponds to that of the first embodiment.

Next, the operation of the second embodiment will be described.

When the bobbin rotates during the sewing process, the binary code portion 63 is received by the sensor 67 as a signal progress. This signal course is a pseudo-random signal sequence (pseu
dozufaellige Signalfolge), and in the following simply PZ
Write as F. This PZF is an analog / digital converter 69
To the output AT of the control element 70 for its length.
The PZF part depending on the period at is converted. The formation of the PZF portion is performed at a constant cycle, while the PZF portion is formed.
The formation of the period, that is to say the PZF period corresponding to the angular range of the sensor 67 passing through one code segment 64 of the binary code part 63, depends on the speed of rotation of the bobbin. Since the number of revolutions is influenced by parameters such as the stitch forming frequency, the stitch length and the filling degree of the bobbin 62, one PZF period corresponds to the PZF part only by chance.

The respective actual PZF part is written into one of the registers 72 or 73 of the ZR memory 74. When these registers 72 and 73 are completely written,
Switch to another register. This avoids data loss.

The autocorrelator 75 stores the stored PZF from the register 72 or 73 whose reading process is interrupted each time a pulse signal is applied to its input KE1.
Call the part, copy this PZF part, and shift the copy to the original until the match with the original occupies the maximum value. From the interval between this maximum and the next maximum obtained by further shifting the copy with respect to the original, the autocorrelated PZF
The cycle time P1 of one PZF period in the part is obtained.

The following equation is used to calculate the autocorrelation function.

[0062]

[Equation 1]

AKF (n) = auto-correlation coefficient, value range (-1, ... +1) PZF _i = actual PZF value of PZF portion M1 = average PZF value of actual PZF portion MK = copy Actual PZ of the PZF part
Mean value of PZF value correlated with F part k = limit of shift range n = shift parameter The AKF coefficient is a quantity that represents the match between the original PFZ part and its copy. In this case, AKF (n) = + 1 similarity maximum AKF (n) = 0 no similarity AKF (n) = − 1 inverse similarity maximum.

In order to avoid as much as possible the influence of a short rotation speed change of the bobbin 62 on the cycle time P1,
The average value generator 76 finally detects the cycle time P1 and the average value P formed from the preceding cycle time P1.
A new cycle time average value PM2 is calculated from M1 and sent to the input unit EN1 of the standardizer 77. From this cycle time average value PM2 and the cycle time comparison value PV (which can be supplied from the output AN of the control element 70 to the input EN3 of the standard 77), a conversion factor is obtained by forming a ratio. This conversion factor must be incorporated into the actual PZF part called from one of the registers 72, 73 of the ZR memory 74. Cycle time comparison value P output from the output unit AN of the control element 70
A target PZF cycle is associated with V. This target PZ
The F cycle corresponds to the binary code portion 63 provided on the flange 61 of the bobbin 62 and is input to the intermediate memory 81 via the operation panel 80. The cycle time comparison value PV is
After addressing the intermediate memory 81 correspondingly, it is read by the input section EZ of the control element.

The PFZ portion thus standardized is sent to the input unit KE1 of the cross-correlator 78. At the same time, the control element 70 calls from the intermediate memory 81 a target PFZ period, which will be referred to below as the original comparison period, from which a mirror-symmetrical comparison period is formed. Control element 70
Sends the original comparison cycle from the output section AK1 to the input section KE2 of the cross-correlator 78, and outputs the mirror-symmetrical comparison cycle to the output section A.
From K2 to the input KE3 of the cross-correlator 78.

The normalized actual PZF part is shifted by the cross-correlator 78 both with respect to the original comparison period and with respect to the mirror-symmetrical comparison period, and coincides with one of both comparison periods. Occupy the maximum value. If this maximum value matches the original comparison period, then the actual PZ
It can be seen that the order of the signals in the F cycle is related to the direction of rotation of the bobbin 62 in the direction in which the main yarn amount is rewound. On the other hand, the maximum value at the time of comparison with the mirror-symmetrical comparison period indicates that a change has occurred in the rotation direction of the bobbin 62, and thus indicates that the yarn remaining amount has been consumed. is doing. When the bobbin 62 is rotating in this rotation direction, the binary code portion 63 provided on the flange 61 is detected by the sensor 67 in the reverse order.

The following equation is used to calculate the autocorrelation function.

[0068]

[Equation 2]

KKF (n) = cross-correlation coefficient, value range (−1, ... +1) PZFNi = PZ of the normalized actual PZF part
F value M1 = PZF of normalized actual PZF part
Mean value of values M2 = average value of original comparison period and mirror-symmetrical comparison period k = limit of shift range n = shift parameter KKF coefficient is a quantity that represents the match between the original PFZ part and its copy. In this case, KKF (n) = + 1 maximum similarity KKF (n) = 0 no similarity KKF (n) =-1 maximum inverse similarity.

By cross-correlating the standardized actual PZF part with the mirror-symmetrical standard period, the KKF coefficient close to +1 or the KKF coefficient reaching this value, and thus the change in the rotating direction of the bobbin 62, can be obtained. When the KKF coefficient represented is determined, the control element 70 outputs from its output AF the signal L in error to the input DRE of the coder 51 instead of the signal H previously output from this output. The control function generated by this corresponds to the control function generated when detecting the change in the rotation direction of the bobbin 6 in the first embodiment.

According to FIG. 10, the casing 10 of the sewing machine
A device for winding the yarn around the bobbin 101 is fixed to 0. This device (hereinafter, the winding device 102
Indicates a rotary drive unit 103 including a bobbin shaft 104.
have. A slide sleeve 105 is provided on the bobbin shaft 104 so as not to rotate relative to it. A bobbin thread turning element 106 extending parallel to the bobbin shaft 104 is fixed to the slide sleeve 105. The turning element 106, which is configured as a pin 107, is a stopper 110 fixed to the bobbin shaft 104 and a recess 108 (FIG. 11) of the stopper 110 used as a support for the bobbin 101 insertable into the bobbin shaft 104. It is movable between a stationary position (FIG. 11) in which the lower thread is not engaged and a turning position (FIG. 12) protruding into the lower thread supply path. Stopper 110 of bobbin 101
In the following, the side flange is denoted by the reference numeral 112, and the flange having the marking portion 114 formed by the bright and dark regions 113 on the outer surface is denoted by the reference numeral 115. The bobbin 101 is prevented from rotating relative to the bobbin shaft 104 by a bending spring (Buegelfeder) 116. The bending spring 116 is fixed to the bobbin shaft 104, and is engaged with the entrainment slit 117 of the bobbin flange 115. At the position of the bobbin 101 on the bobbin shaft 104, which is given in advance by such a configuration, the entrainment slit 119 that is formed in the other bobbin flange 112 and is used as the opening 118 for penetrating the turning element 106.
Are directed towards the turning element 106.

The slide sleeve 105 is composed of an oscillating body 122.
It has a circumferential guide groove 120 for a pin 123 provided on the fork-shaped end 121 of the. The rocking body 12 rotatably supported around the fixed support member 124.
2 is a second oscillating body 125 extending in parallel and a connecting rod 12
A parallel link mechanism 127 is formed together with 6. This parallel linkage 127 forms an adjusting device 129 for the turning element 106 together with an actuator 128 which is non-rotatably connected to the rocker 125.

The marking portion 114 provided on the bobbin flange 115 is monitored by a sensor device 130 shown in a simplified manner. In this case, the light emitted from the light emitting diode 131 is reflected by the marking portion 114 and then sent to the photoelectric detector 132 configured as a phototransistor.

FIG. 13 is a simplest circuit diagram of the individual components of the controller 133 required to operate the winding device 102. The emitter of the photoelectric detector 132 is connected to the counting input ZE of the counting device 134. The counting device 134 has a reset input RE connected to the output A1 of a control element 135 configured as a microcomputer. The output A of the counting device 134 is connected to the input E of the comparator 136. The set input SE of the comparator 136 is connected to the output A2 of the control element 135. The output A of the comparator 136 is connected to the input E1 of the control element 135.

A program memory 137 is connected to the input section E2 of the control element 135. Program memory 1
A control program for the control element 135 is stored in 37. The input section E3 of the control element 135 is connected to the operation panel 138. The operation panel 138 is connected to the output section E4 of the control element 135 via the input memory 139. The output section A3 of the control element 135 is connected to the rotary drive section 103 via the power circuit 141, and the output section A4 is connected to the actuator 12 via the power circuit 142.
8 is connected. The rotary drive unit 103 has a control element 13
5 and the actuator 128 is connected to the input E6 of the control element 135.

The input section E7 of the control element 135 is simply connected to a mitt switch 143. The limit switch 143 is pressed when the bobbin is filled with a predetermined amount.

Next, the operation of the winding device 102 will be described.

When the empty bobbin 101 is inserted into the bobbin shaft 104, the operation panel 13 is connected to the input section E3 of the control element 135.
The signal is sent via 8. The control element 135 then sends a signal from its output A3 to the power circuit 141 to turn on the rotary drive 103 and thus drive the bobbin shaft 104.

The light beam of the light emitting diode 131 hits the bright and dark regions of the marking portion 114, and the bobbin 101 is rotated and the reflection characteristic is changed, so that it is received by the photoelectric detector 132 as a signal whose intensity changes. Bobbin 1
The number of signals per revolution of 01 is the bobbin flange 1
The number of rotations of the bobbin 101 can be obtained from the number of the signals because it is given in advance by the number of the light / dark regions 113 on the fifteen. The signal received by the photoelectric detector 132 is sent to the counter 134. The counting device 134 outputs the final count value from its output A to the comparator 1
36 to the input section E. The comparator 136 sets this count value as a preset value. This preset value is the operation panel 1
38, intermediate memory in the input memory 139 at the beginning of the winding process and then readable in its input E4 by the control element 135, after being output from the output A2 of the control element 135, the comparator 13
6 set inputs SE can be sent. Unless the count value matches the preset value, the comparator 136 has its output A
No signal is output from. On the other hand, the control element 135
When the input section E1 of the bobbin 101 receives a signal from the comparator 136, the bobbin 101 is wound by the predetermined number of thread windings forming the thread remaining amount.
Exists in. When a signal notifying that the rotation drive unit 103 is stopped is input to the input section E5 of the control element 135, the control element 135 outputs a signal for stopping the rotation drive section 103 from its output section A3 and also outputs from the output section A4. It emits a signal to turn on the actuator 128.

By moving the actuator 128, the oscillating body 125 is moved in the direction of the bobbin 101 by a predeterminable rotation angle, whereby the connecting rod 126 is moved.
The rocking body 122 is pivotally moved around the fixed support member 124 via. Thereby, the pin 123 / the guide groove 120
The rocking body 122, which is engaged with the slide sleeve 105 via the connecting portion made of, moves the slide sleeve 105 in the direction of the bobbin 101 to the position shown in FIG. This movement causes turning element 106 to rest (FIG.
It is moved from 1) to the turning position (Fig. 12). When a signal is input from the actuator 128 to the input E6 of the control element 135 that the turning element 106 has reached the turning position, the control element 135 emits a signal from its output A3. This signal causes the rotation drive unit 103 to operate in a direction opposite to the rotation direction up to that time, thereby reversing the winding direction of the yarn winding. Due to a change in the direction of rotation, at least a part of the thread winding forming the thread remaining amount is loosened or wound.
Blocked by turning element 106. This is because when the bobbin starts to rotate in a new rotation direction, the bobbin thread is turned by the turning element 1.
This is because it is pulled toward 06. Further turning element 1
By 06, the first thread winding to be wound in the new rotation direction is tightly wound.

A signal for turning on the rotary drive 103 in the new rotation direction is output from the output A3 of the signal element 135, and a signal from the output A1 of the control element 135 to the reset input RE of the counting device 134. Is output, which resets the counting device 134 to its initial value. The counting device 134 accumulates the signals in the new direction of rotation of the bobbin 101 until the second preset value is reached. This second preset value can also be input on the operation panel 138 in the same manner, and the control element 13 can be input via the input memory 139.
5 and can be applied to the set input SE of the comparator 136. When the signal is output from the output A of the comparator 136 when the second preset value is reached, the signal is output from the output A4 of the control element 135 to the actuator 128. This causes the actuator 128 to move the turning element 106 back to its rest position and to return itself to the home position. The second preset value is selected so that a sufficient number of windings are performed in the new winding direction. Therefore, the turning element 10 does not affect the subsequent winding process.
6 can be returned to its rest position.

When a signal is received at the input E6 of the control element 135 to indicate that the actuator 128 has reached its home position, a signal is subsequently output from the output A1 so that the counting device Thirteen
4 is reset to its initial value and turned on until the next winding process begins.

In the winding process, the limit switch 143 is used.
From the input to the input E7 of the control element 135 continues until the filling of the bobbin 101 is signaled. afterwards,
The control element 135 issues a signal from its output A3 to stop the rotary drive 103.

Next, the advantageous configurations of the present invention will be listed.

(1) A device characterized in that the detected phase shift can be associated with the target phase shift with respect to its code by the comparing device (45).

(2) The comparison device (45) can read one signal of each signal course at the rhythm of the stitch forming frequency, and each time it is formed from the last signal pair and the target signal course associated with it. An apparatus characterized in that it is possible to determine the deviation of the phase shift from the target phase shift by comparing the two signal pairs when the pair of comparison signals does not match.

(3) A device characterized in that a bobbin jitter canceller (49) is arranged after the comparison device (45).

(4) The direction of rotation detector (50; together with the yarn breakage detector (27) which outputs a control function when at least one signal transition has an interruption which lasts for a predeterminable number of stitch formation cycles. 83) is connected to the error decoder (51), and the error decoder (5
According to 1), a device capable of generating a sewing function related to the detected thread disorder.

(5) It has an additional device (58) for ensuring that the seam continues uninterrupted with respect to the upper thread after the obstruction of the lower thread is removed, and the operating state of the additional device (58) is The control function of the thread breakage detector (27) or the comparison device (4) after a predetermined number of stitch formation cycles.
5; 79) continuing the first control function of the comparison device (4
5; 79) The device according to the above item 4, characterized in that the device is made to operate by any of the second control functions.

(6) The counting device (134) determines the number of rotations to be performed by the bobbin shaft (104) between the change in the direction of rotation of the bobbin shaft (104) and the return of the turning element (106) to the rest position. ) The device which can be determined in advance by setting the end value of.

(7) The turning element (106) is replaced by the bobbin (1
01) is movable parallel to the axis of the bobbin flange (112, 115) and is formed in the opening (118).
A device capable of penetrating into the bobbin (101) through the device.

(8) The opening (118) is provided with the entrainment slit (11) provided on the bobbin flange (112; 115).
9) Device according to item 7 above, characterized in that it is formed by

[0093]

In the two monitoring positions, the signal profile received at the first monitoring position in the direction of rotation of the bobbin during withdrawal of the main thread amount precedes the other signal profiles. The phase shift at that time depends on the mutual distance between these two monitoring positions. This phase shift is detected and compared with a preset phase shift. As long as the bobbin maintains its rotating direction, the two phase shifts are the same.

When the direction of rotation of the bobbin changes, at this time point, the first signal which has been preceded until then follows the second signal. Since the new phase shift caused by this is different from the target phase shift, it is detected from this difference that the rotation direction of the bobbin has changed, and thus it is detected that the yarn remaining amount has started to be consumed.

If only one monitoring position is provided, the signal of the received signal trace is analyzed for at least one characteristic of the signal such as the signal transit time or the strength of the signal and the different features are analyzed. From the order of, the order of signals (hereinafter simply referred to as a signal string) is obtained. By comparing this signal sequence with the signal sequence of the target signal which can be determined in advance, it is possible to determine whether or not they match. When they match, the main yarn amount is consumed, and the bobbin rotates in the initial rotation direction. On the other hand, when a signal train that is mirror image of the target signal train is received, the signal trains do not match and it is detected that the rotation direction of the bobbin has changed. It In order to monitor this change in the direction of rotation of the bobbin with particular certainty, it is necessary not only to check whether the received signal sequence matches the signal sequence of the target signal, but also to have a mirror image of the signal sequence of the target signal. It is also preferable to check whether or not it matches the signal sequence that is.

In order to monitor whether the bobbin thread has broken, it is sufficient to evaluate the individual signal course. The signal frequency of the individual signal course is a quantity that represents the number of revolutions of the bobbin and thus a quantity that represents the amount of bobbin thread withdrawal. Therefore,
The signal frequency is applied only while the bobbin thread is normally pulled out from the bobbin. For example, when the withdrawal of the thread is temporarily interrupted due to the slack of the bobbin thread, the output of the signal ends, but when the slack portion is consumed, a new signal is output. Such a phenomenon does not reduce the quality of the seam, so if there is no change in the signal before reaching the pre-determinable number of stitch formation cycles,
No control function is generated. On the other hand, if a thread break occurs, this thread break continues as a continuous thread failure until the number of stitch formation cycles that can be determined in advance is reached, thus generating a control function.

The method according to the invention makes it possible to detect a large number of different thread faults and to generate in each case a control function advantageous for a particular thread fault in the stitch former.
A specific control function is associated with each of the yarn disorders. For example, when a thread breakage occurs, the sewing process is immediately terminated, while when it is detected that the remaining thread amount is being consumed, the sewing process is continued after the stitches to be formed are completed. It is preferable to discontinue.

With the device according to the invention as defined in claim 2, the phase shift between the two signal paths can be detected and compared with the target phase shift. With the device according to the third aspect, it is possible to detect a signal train of one signal course and to compare it with a signal train of a target signal course.

When the direction of rotation of the bobbin changes, only the sign of the phase shift changes and its magnitude does not change. Therefore, the interval between the two monitoring positions according to claim 1 is at least 1.
It is constant during one sewing process.

In the device according to the fourth aspect, the degree of filling of the bobbin is set in advance, and preferably the number of rotations of the bobbin shaft is set in advance, so that the degree of filling of the bobbin is related. When the bobbin is wound around the bobbin a number of times, the rotation direction of the bobbin shaft changes and
The turning element is moved from its rest position to the turning position. An indication of the predeterminable filling degree of the bobbin is advantageously monitored by the counting device. The counting device comprises a sensor device, which receives a predeterminable number of signals each time the bobbin axis is pointed once. These signals are
It can be caused by the bobbin shaft itself, or by the marking part of the bobbin.
Further, the filling degree can be displayed by a scanner that can be adjusted depending on the desired number of windings and the thickness of the yarn.

The turning element forms, in its turning position, a support for the thread winding section wound in the previous direction of rotation, and when the bobbin shaft and the bobbin are driven to rotate in the opposite direction, the bobbin thread is supported by this support. Be pulled towards. Therefore, part of the last wound yarn winding portion of the yarn remaining amount will not sag or be pulled out of the bobbin again as a result of a change in the direction of rotation. In addition, the turning element ensures that the first thread winder wound in the new direction of rotation is tightly wound.

[Brief description of drawings]

FIG. 1 is a diagram showing a shuttle containing a bobbin and a sensor device.

FIG. 2 is a circuit diagram of a control device.

3A, 3B, 3C and 3D are diagrams showing monitoring positions on a bobbin monitored by a sensor device at different rotational positions of the bobbin.

FIG. 4 is a graph showing the signal course obtained for the rotational positions A, B, C, D of FIG.

5 is a table showing peculiar signal points of the graph of FIG.

FIG. 6 is a graph similar to FIG. 4, but showing a signal curve when the rotation direction of the bobbin changes.

FIG. 7 is a table similar to FIG. 5, but showing the signal progression when the rotation direction of the bobbin changes.

FIG. 8 is a view corresponding to FIG. 1, but showing one sensor device and an embodiment in which another marking portion is provided on the bobbin.

FIG. 9 is a circuit diagram showing a second embodiment of the control device.

FIG. 10 is a view showing an apparatus for winding a thread on a bobbin.

FIG. 11 is a view showing the position of the turning element for the bobbin thread before the rotation direction of the bobbin shaft is changed.

FIG. 12 is a diagram showing the position of the turning element immediately after the rotation direction is changed.

FIG. 13 is a circuit diagram of a control device of the device for winding the yarn.

[Explanation of reference numerals] 6,62,101 bobbin 18,68 control device 45,79 comparison device 50,83 rotational direction detector 104 bobbin shaft 106 turning element 134 counting device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wolfgang Hauk Germany Day 6751 Weiler Bach Ostpreussenstrasse 27 (72) Inventor Reiner Klein Germany Day 6750 Kaiser Slautern Rosenstrasse 19 (72) Invention German Bernhard Meltel Day 6753 Enken Bach Arsenborn Ludwig Volker Strasse 6 (72) Inventor Karl Heinz Walter German Republic Day 6751 Weilerbach Friedhofstraße 23 (72) Inventor Horst Zinsmeister Federal Republic of Germany Day 6750 Kaiser Slautern Buchenlochsi Utrase 35

Claims (4)

[Claims] 1. A bobbin of a hook is wound around a bobbin in a direction opposite to the winding direction of the main yarn amount, and a yarn winding portion having a previously determined yarn remaining amount is wound, so that the remaining yarn amount can be withdrawn. In the yarn monitoring method of the stitch forming machine, wherein the rotation direction of the bobbin changes to a direction opposite to the rotation direction at the time of withdrawing the main yarn amount, and the control function is generated by the change of the rotation direction of the bobbin. a) When the bobbin (6; 62) rotates, the control device (18;
68) generating a signal for b) forming a first signal course from this signal at a first monitoring position, and c) at a second monitoring position with respect to the first signal course. Receiving a second signal course with a phase shift, or determining the order of the first signal course, d) evaluating at least one signal course depending on the stitch forming frequency. E) When the phase shift between the first signal course and the second signal course changes, or when it is confirmed that the order of the signals of the first signal course has changed, the thread residue Outputting a control function indicating the start of consumption of the quantity and / or a control function for preventing restart of the sewing machine after a stop, f) interruption of a signal until a predeterminable number of stitch formation cycles is reached When the sewing continues, Monitoring method according to claim, to generate a control function to terminate the. 2. A yarn monitoring device for carrying out the method according to claim 1, wherein the device is provided in a stitch forming machine with a yarn monitoring device having a rotation direction detector, the device comprising: The direction detector (50) has a comparison device (45), by means of which the comparison device (45) compares the two signal traces with each other, it is possible to detect a phase shift between the two signal traces and It is possible to correlate with the target phase shift, and by the comparison device (45), when the detected phase shift and the target phase shift do not match, it is possible to generate a control function for notifying the rotation direction change. The device characterized in that 3. A yarn monitoring device for carrying out the method according to claim 1, wherein the device is provided in a stitch forming machine with a yarn monitoring device having a direction-of-rotation detector. The direction detector (83) has a comparison device (79) by means of which the signal of the first signal progression is output in the sequence of the bobbin (62) at the time of consumption of the main yarn quantity. It is possible to associate with a signal of the target signal course associated with the direction of rotation, and by means of said comparison device (79) the first
A device capable of generating a control function for notifying the change of the rotation direction when the progress of the signal and the progress of the target signal do not match. 4. An apparatus for carrying out the method according to claim 1, comprising a winding device for winding a yarn on a bobbin, the winding device varying the winding direction of the yarn. In a device having a counter for rotating the shaft, the bobbin shaft (104) is preferably rotated a preset number of times after the bobbin (101) has reached a predeterminable filling degree. After rotating, the bobbin shaft (10
The direction of rotation of 4) can be changed, and the turning element (106) for turning the yarn is moved by the position adjusting device (129) from the rest position outside the yarn feeding path to the yarn feeding path. An apparatus which is movable to a turning position located inside.